“Study on the Effect of pH and Contact Time on the Adsorption Efficiency of Trivalent Arsenic (III) Ions from Aqueous Solutions Using Neem Leaf Powder (Azadirachta indica)”, م ع ش, vol. 10, no. ملحق 39, pp. 595–603, Apr. 2026, doi: 10.65405/zkzqx635.